I need some help with ideas for an SCP that I want to do. Here's a brief summary of what it looks like: It's a living shark from an extinct genus of shark with no fins, a segmented body, bony plates, invincibility, a toxic mucus, human-level intelligence and emotions, and the ability to transform into anything that it eats.

I have to be a little blunt here in the name of honesty: This is a list of traits and powers, not an idea.

If you really want to make a shark SCP, you need to radically shift your thinking here: your goal should not to be making a super-dangerous shark-monster. Your goal should be making an ancient species of shark with some novel aspect that makes it more than just an ancient species of shark.